A corpora



G. W. JACKSON.

TRACTOR.

APPLICATION men MAR. as. ma.

1,313,219. PatentedAug.12,1919.

G. W. JACKSON.

- TRACTOR.

APHJCATION HLED MAR. 13' lili- Patented Aug. 12,1919.

4 MEETS-SHEET 2.

G. W. JACKSON.

TRACTOR.

APFUCATION FILED MAR :8, 191a.

Patented Aug. 12, 1919.

4 SHEETS-SHEET 3.

G. .W; JACKSON.

TRACTOR.

APPUCA'HOR map mm 13. ms.

'razenwl Aug. 12,1919. i

4 SHEETS -SHEET 4.

U. S. Letters Patent, Serial UNITED STATES PATENT OFFICE.

GEORGE JACKSON, OF CHICAGO, ILLINOIS, ASSIGNOR, BY MESNE ASSIGNMENTS, '10

AMERICAN POWER SHOVEL COMPANY, OF MILWAUKEE, WISCONSIN, A CORPORA- TION OF WISCONSIN.

TRACTOR.

Specification of Letters Patent.

Patented Au' 12, 1919.

Application filed March 18, 1918. Serial No. 223,058.

Ihero'by declare that the following is a full,

clear, and exact description thereof, refer- I ones being had to the aocmnpanying drawlugs, and to the characters of reference marked thereon, which forms: part of this specification.

This invention relates to improvements in tractor drives and refers more particularly to the means for transmitting the driving power to the. endless'traction belt elements 'A nether object of the invention is toprovide a= mechanism adapted to tractor drive 1 by which great power may be impressed on the machine in the direction of an attack to the work when adapted to a so-called loading l'uachine, wherein an endless series of buckcis are carried on a boom and the boom is directed to its work by tractive power applied through the ti action bolts. The mechanism herein shown is adapted to this latter type of machine, such, for instance. as is illustmted in my co-pending ap licat-ion for 0. 195,213 filed on the 8th day of October, 1917.

Other objects of the invention are to improve, simplify, and render more murpact mechanisms of this general character, and the invention consists in the combination and arrangement of the parts shown in the drawings anddcscrihed in thespecifiiaition,

F ig. 3 is a partial bottom view and partial horizontal section of the mmhanism.

Figs. 4 and 5 are sections taken on the lines'4-4 and 55 of Fig. 2.

Fig. 6 is a perspective detail illustrating the motor control.

As shown in the drawings, the frame of the machine comprises two pairs of longitudinal beams 10, 10, of channel cross section as shown, transverse beams 11, 12 that are joined at their ends to the inner longitudinal beams. and a cast metal bed late 14 of a dimension to extend from en to end and from side to side of the frame,'as best shown in Figs. 2 and 4. Said bed plate is bolted-or otherwise theilongitudi no] and transverse heainsand tl'ie beams are secured at theirends to each otherin a suitable way as by the angle fittings 12'. 15 designates a cast metal turntable which is supported on the bed plate 14 to swing about an axis hicated centrally of the bed plate. The turntable is supported on the bed plat through the medium of a plurality of rollers 16 and the turntable is preferably shaped to form (asings or housings 17 to cover said rollers.

The turntable rotates about an axis consisting as herein shown of a hollow shafit 18 that is seated in and extends upwardly through a boss 19 located centrally of the bud plate, said shaft being flanged at its lower end and being held in place by a wlllillfil' 20 which surrounds it above the turnta 0. I

The turntable is rotated on the bed plate through the medium of a .circ'ular rack 22 that is formed on an upstanding flange on .t' upper face. of the bed plate and a pinion 23 that is mounted on a shaft 24 which has bcm-ing in and extends through the turntable. The shaft may be connected with any suital'rlo soul're of power, such, for instance, as shown in my aforesaid appliration. Serial Number 195213.

25, 26 designates front. and rear stub shafts that are mounted in suitable bearings 27, 28, depending from and attached to the side beams l0. Said shafts carry sprocket They constitute the traction belt elements of the drive n'iocliunism. Said traction sections or elements are formed with lugs 31" that are connected to jointed links 31* to constitute the endless traction belt elements. The lugs 31'. constitute also guides for the sprocket wheels 29 :l'nd: 30 to hold the traction belt elements in place. Those portions of the traction belt elements betw en the sprocket wheels 29 and 30 are presse upon the roadway to give proper tractive ell'ect thereto by means of pulleys i0, theshafts of which are carried b brackets 41 that are attached in any suita lemanner to the frame.

The sprocket wheels at; one and of the machine mesh with pinions 32 .which are fixed to and are driven by the sections of a transverselv dis osed divided shaft 33 that is mounted in earings 34 carried by and depending from the side beams 10 of the frame and an intermediate bearin 35 which is carried by a bracket 36 whic 'depends from and is bolted to a cross beam'37 which extends between and is secured at its endstothe' side beams 10 in any suitable manner, as by angle fittings 37.

The divided shaft is shown as driven by motors 45, that are attached to and supported by pads 46 which are-secured to the rear-transvcrse frame beam 11. Th driving,

connections" between. said -motors nd the? divided shaft are made as follows:

The power shafts 48 of said motors, which areseparate from each other, are supported at their outer ends in bearings 49 carried by the inner side beams 10 of each pair. Fixed to said shafts are sprockets pinions 50 that are connected by sprocket belts 51. to sprocket wheels 52 which are fixed to sleeves which carry the sprockets 55, as shown in Fig. 5, mounted on the opp0 site ends of a solid shaft 53 that is so ported in suitable bearings 54carried by t e inner side beams 10. Said shaft 53 also carries sprockets 55 that are connectedby sprocket belts 56 with sprocket wheels 57 that are severally fixed to the. sections of the divided shaft 33. Through the sprocket belts and gears described the vspeed of the motors 45 is suitably reduced and applied through the pinions 32 to drive the sprocket wheels 30 of the traction drive.

The motors 45 'herein shown are air motors of the rotary type, and are supplied with motive fluid; (com ressad air) through supply pipes 60 which eadto valves 61 that control the su ply of the motive fluid to said motors. Said valves control the suppl of motive fluid to the motors for contra ling the speed of the motors, and are also reversing valves. The shafts 62 of said valves 61 carry pinions 63 which mesh with gear wheels 64 that are connected to-a valve control mechanism for eontroll ing the supply of motive fluid t0 the motors and for reversing the-motors. The said wheels 64 are fixed to shafts 65, 65 t at are rotatively mounted in bearings 66 which are suppo from short channel bars 67 that extend rear- 'and incloses the bar 11.

which is fixed to a transverse rock shaft 76 mounted insult/able bearings su'p on t tumtable and pr0vided at its on with han levers 78, one at each sid6 ..of the innchl'ze' frame. The tubularjbar F8 18 likew' provided at its upper-end with an arm 7931 .which is conn a rock aft 80 that'is providadiateitaendaone at each side ofthemachi'ne'grw tli handlevers 81, Y The rock shafts 76. and fldmjhua provided at both ends with hand'levo ri in order that the motor valves may be controlled.

from either side of the machine. By

v-ated, depending on the-direction ofii'ockin motion so as to thereby cont ol the motor va vcs.

adjusted for sup lying meteor-less o motive fluid to. a motors 'or for reversing the motors, valves by the mechanism or in described permits both cfthe motors to o v m the same direction either forwarder to drive the also no forwardly or-fr aarwardl or permits one of said valvosto be The motor valves thus bout roll ed:ma? be. the

The adj of the, motor I opera to rotate itsassociatad' in,

one'direction while theother motor ialrotated in the other direction to turn thembhine on an axis'betweon the sides of;

machine; or to rotate one motor Whgilatho other is stationary to him the on the axis adjacent to one side or the-machine; The speeds of the motors ma. be inimmediately adjusted to secure di erantial actions of the motors on the trachea belts for purposes of more delicately steering or directing the machine; y

- I claim as my invention,-

1. A creeping tractor drive comp'risin a rigid frame embracing a horizontal (1' plate and turntable mounted'thereon, front and rear pairs of toothed "wheels mounted in the frame, endless creeping traction belts mounted on and driven by said wheels,

power means carried by the frame and connecterl to the said toothed Wheels t0. drive thesameand the endless traction belts, alve mechanisms associated with said power means and a valve gear having parts coaxial with the rotative axis of the turntable onthe bed plate, with means above the turn table for operating the valve gear.

2. A creeping traction drive, comprising a frame, consisting of two series of side beams and transverse cross beams with a bed plate mounted on and supported by said beams, stub shafts rotat-ivel mounted in the side beams at the front an rear ends of the frame, toothed wheels on said shafts, endless creeping traction belts mounted on and driven by said wheels, smaller driving gears meshing with the toothed wheels, a divided shaft on which said gears are mounted, sprocket wheels carried by said divided shafts, a second shaft, sprocket wheels rotatably mounted on said second shaft, and a driving belt from sprockets on said second shaft to power shafts, power shafts, and motors driving said power shafts, substantially as set forth.

3.,A creeping tractor drive comprising a frame, front and rear wheels, endless creeping traction belts mounted on and driven by said wheels, a divided shaft mounted in bearings at one end of the frame and provided with pinions meshing with the wheels at the corresponding end of the frame, a solid shaft extending across and mounted in the frame adjacent to the divided shaft, two motors having separate shafts mounted in the frame, a plurality of sprocket wheels carried on sleeves rotatively mounted on the solid shaft, driving connections between said power shafts and said sprockets, and other drive connections between sprockets on said solid shaft and the sections of the divided shaft, substantially as shown.

In testimony whereof I claim the foregoing as my invention, I hereunto append my signature at Chicago, Illinois, this 16th day of March, 1918.

GEORGE W. JACKSON. 

